Chemical Engineering MCQs

Page No. 316

Desirable “Micum Index” values of metallurgical coke are ___________________?


aM40 > 78% and M10 < 10%


bM40 > 4% and M10 10% and M10 98% and M10 < 2%


cBoth A. & B.


dNone of these



Which of the following fuels is the best for burning on chain grate stoker ?


aNon-caking coal


bCaking coal


cCoking coal


dPulverised coal


View Answer Non-caking coal

“Overfire burning” in a furnace is a phenomenon characterised by the __________________?


aSupply of excess fuel


bSupply of excess air


cBurning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air


dNone of these



A coal gasifier operating at 20 atm. (e.g. Lurgi gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having _____________________?


aHigher methane content and thus higher calorific value


bHigher carbon monoxide content


cLower carbon dioxide content


dNone of these



For every 10% increase in the excess air; the fuel consumption increases by _______________ percent?


a0.1


b0.2


c0.5


d1.0


View Answer 0.1

Main use of hard coke produced by high temperature carbonisation is in the ____________________ ?


aIron blast furnace


bCupola in foundries


cSinter making


dDomestic ovens


View Answer Iron blast furnace

Percentage of carbon monoxide in blast furnace gas may be around ____________________ ?


a8


b14


c22


d52


View Answer 22

Which is the most matured coal ?


aLignite


bBituminous


cSemi-anthracite


dAnthracite


View Answer Anthracite

Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its ___________________?


aEmissivity factor is higher


bSulphur content is lower


cFlue gas has lower dew point thereby facilitating more waste heat recovery


dAll A., B. and C.


View Answer All A., B. and C.

Incomplete combustion of a fuel is characterised by the high _______________ in the flue gas?


aSmoke


bTemperature


cOxygen


dCarbon monoxide


View Answer Carbon monoxide

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